Way too many games on my mind... >_<. ok I'll try.
- Half-life 2 Ep.2's ending was seriously one of the most shocking and emotional endings I have ever seen in a game.
- Attacking the German parliament building in COD: World at War during the Russian campaign. or to be more honest the ENTIRE Russian campaign.
- Halo 3 had a lot of epic moments especially the ending.
- The first two hours of Oblivion.
- fending off swarms of zombies in top of a hospital building in left 4 dead.
- The entire Mass Effect series. yeah it's that epic
gahhh I mostly mentioned shooters. have to think of more...